Emergency personnel treat victims who were involved when chemicals were released in an area at the water park at Michigan's Adventure on July 11, 2014. KEN STEVENS

MUSKEGON COUNTY, MI — The chemical exposure at a wave pool at Michigan's Adventure on Friday, July 11 is said to be the result of a small chlorine gas cloud, according to Muskegon County officials.

Muskegon County Hazmat Official Christopher Dean said most of the patients who were treated had difficulty breathing as a result of the exposure to the two chemicals that mixed together, creating a "small chlorine gas cloud."

"There were two common household pool chemicals – muriatic acid and sodium hypochlorite – which when they mix together in a large enough quantity, produce chlorine gas," said Dean, who is also the Muskegon Heights fire chief. "Normally, it's so diluted it doesn't create a problem."

Michigan's Adventure is looking into the events that caused this to happen, Dean said. The amusement park shut down the wave pool for the rest of the day and officials are evaluating their procedure.

"It's too early to make a clear determination on what caused it," Dean said. "Michigan's Adventure responded and provided assistance to their patrons and notified other emergency response agencies in the process."

Muskegon County Sheriff Dean Roesler confirmed that at least two of those who were taken away by Pro Med were lifeguards from the park.

"At least two of the lifeguards that were assigned to that particular pool did respond quickly and rapidly (and) started bringing people to safety," Roesler said. "In doing so, they exposed themselves and were taken to the hospital where they have respiratory problems."